hey newuser01, from what I've seen, the drip tip for the stardust screws on & off, so you can only use other drip tips that screws in. I think most drip tips do not screw in, so I guess it might be proprietary & you will not be able to use your own non-screwable drip tip. I think they did that do help prevent against leaking. To refill the stardust, I think you just unscrew the drip tip and drip on the sides. for the mini vivi novas, you can pull out the drip tip to replace with your own drip tip. To refill though, there is a unscrewable top part.
I did notice that the stardust is a bit lighter & sleeker than the mini vivi novas, but is labeled only to 1.6mL while the vivi mini novas go up to 2.0mL.